Casting technique for manufacturing mold core by using resin sand

Abstract

The invention discloses a casting technique for manufacturing a mold core by using resin sand, which sequentially comprises the following steps: 1) liquid iron is melted down: the measured raw materials are put into a line-frequency furnace and heated to be melted into the liquid iron; 2) molding sand is sent into a dry furnace to be dried, and then put into a sand mixer and simultaneously added with phenol resin and curing agent to be mixed with the dried molding sand, wherein, the curing agent comprises phenol-based polyisocyanate and triethylamine, and the weight of the phenol resin is 10-20 times as heavy as that of the triethylamine; the mixed sand is put into a casting model machine for manufacturing the mold core; 3) after being molded, the mold core is processed by spraying, water based paint is mainly applied in the spraying treatment, and then the sprayed mold core is dried in a dryer. As the curing agent in the technique is formed by the phenol-based polyisocyanate and the triethylamine, external heating is not needed in the technique for manufacturing the core; the resin sand can be rapidly cured under the catalysis of the triethylamine, thus improving the production efficiency.

Description

technical field [0001] The invention belongs to the field of casting, in particular to a casting process method for making a mold core with resin sand. Background technique [0002] Most of the molding and core-making process in the foundry adopts the furan resin sand process. In the furan resin sand process, the binder is furan resin, and the curing agent is p-toluenesulfonic acid. Curing agent, which is a molding and core-making process that is dried and hardened in a core box or a sand box at a certain temperature; in the process of mixing furan resin sand, the amount of furan resin added is generally the amount of quartz sand. 0.8% to 1.2%, the amount of sulfonic acid curing agent added is 30% to 50% of the resin. But this kind of furan resin sand hardening molding needs heating, and curing speed is slow. Contents of the invention [0003] The object of the present invention is to provide a casting process method for making mold cores with resin sand. No external hea...

AI Technical Summary

Problems solved by technology

But this kind of furan resin sand hardening molding needs heating, and the curing speed is slow